We all know that a long Instagram session can leave you feeling a bit flat (is everyone on holidays in Greece right now!?) but new research from two Sydney, Australia universities has quantified just how fast the app can ruin your day.

According to new data from the University of New South Wales and Macquarie University, as little as half an hour a day spent trawling Instagram can make women fixate negatively on their weight and appearance.

The study, which drew on survey results from 350 Australian and American women aged 18-25, found that the more participants looked at so-called “fitness inspiration” images or compared themselves to celebrities such as Kendall Jenner or Karlie Kloss, the unhappier they felt about their own bodies.

Today is the beginning of The Butterfly Foundation’s Love Your Body Week. Foundation CEO has told The Daily Telegraph that “appearance-based talk and body comparison can be unremitting, with little understanding of how detrimental it is for self-esteem and mental health.”

“Given the increase in popularity of image-based social media platforms with adolescents, it is critical to look at ways that help to mitigate negative effects,” she said.